Sound-reproducing device



BRITANNIO SOLAR() DELBOHGO. SOUND REPRODUCING DEVICE.

APPLICATION FILED JULY 7, 1919.

BRITANNIO SOLARO DEL BORGO. souND REPRODUCING DEVICE.

' APPLICATION FILED JULY?, 19|9A. 1,354,474, I Patented Oct. 5, 1920.

2 SHEETS-SHEET 2.

Fig. 2

UNITED smxrssY BRITANNIO SOLARO DEL BORGO, OF PARIS, FRANCE.

SOUND-REPRODUCING DEVICE.

Specification of Letters Patent.

Patented Oct-5, 1920.

Application filed .'uiy 7, 1919. Serial No. 309,210.

'0 aZZ whom t may concern.'

Be it 'known that I, BRrrANNro SoLARo DEL BORGO, a subject of the King of Italy, and resident of 68 Rue Lauriston, Paris, France, have invented certain new and useful improvements in Soundlieproducing Devices, of which the following is a speciiication.

The present invention has for its subject a vibrating and adjustable mechanical de vice for transmitting to a sound box the sound waves formed on a surface. This device may be used for a number of diii'erent purposes and is particularly applicable to sound-boxes or phonographs.

The device comprises a member of any suitable material pivotally mounted on an axis and two levers secured to the member, one of the levers being rigid and adjustable in length, while the other lever is flexible and or' constant length. rlhe member to which the two levers are secured orms an adjusting carriage for varying the length of the rigid lever.

In the accompanying drawing is shown, by way oi' example, one form of construction according to this invention.

Figure l shows a diagrammatic view of the device, partly in elevation and partly in section.

Fig. 2 shows a front elevation, and

Fig. 3 is a section on the line I, I, I of Fig. 2, of a construction of the device applied to the sound-box oi a phonograph.

As has been stated above and as shown diagrammatically in Fig. l, the device essentia-lly comprises a member a, which can oscillate around an aXis b, and has two levers c and (Z. The lever c is rigid and can be adjusted in length by means of any suitable device. The lever Z is flexible; it can act as a spring and it connects the member a to the sound-box e.

The device is vibrated by the end ofthe lever c and transmits the vibrations to the sound-box e by means of the member a.

Figs. 2 and 3 show how the device can be applied in practice to the sound-box of a phonograph. rlhe member l screws on the end of the rigid lever 2 (lever c in the diagram), which itself is screwed into the part 8. This latter is supported by pivots 4 carried by the casing 5 of the sound-box.

In this manner simple and effective means are obtained for varying at will the length of the lever 2, by screwing this lever more or less into the part rlhe member l forms a lock nut tor the lever, and the latter may also be locked by means of a set screw.

At its free end the lever c carries, in the well known manner, the needle or sapphire for the reproduction of sounds.

To the part 3 is secured one end of the flexible lever Z of constant length, the other endot the lever being secured to the diaphragm 8 of the sound-box.

The shape of the lever 7 is such that it may yield and act as a spring on the soundboX. The diaphragm 8 of this sound-box (to which the end of the lever 7 is firmly secured) is rigid.

It will be seen from this form of construction that the member l acts as an adjusting carriage for the variations in length of the rigid lever. It will be understood that the invention is not limited to the particular arrangement hereinbei'ore described and shown in the drawing. The adjustment could be effected by means of a movable member mounted on or coperating with a rack, by means of a worm and lock nut or in any other suitable manner.

rlhe yoperation of the device is as followsz- The lever 2 follows, by means of a needle or sapphire, the sinuosity of the sound waves on the disk or other surface, and communicates the vibrations to the member 1 to which it is rigidly secured. This member l oscillates on its pivots 4;. This latter acts as a spring and permits the whole system to vibrate on the pivots 4.

These vibrations of the whole system are reverberated in the sound-box which considerably magnifies the sounds produced.

By means of the adjusting device the length of the rigid lever can be increased or reduced so that the magnitude of the vibrations transmitted can consequently be varied.

rlhe member 1, in consequence of its inertia, also contributes to the increase of the magnitude of the vibrations.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is l. The combination with a sound-box containing a diaphragm, of a weighted member pivotally mounted on said sound box, a springy lever connecting the weighted member to the diaphragm, and a lever Vcarrying the reproducing member, said lever being adjustably mounted in the Weighted member.

2. In a sound reproducing device,A the combination with a sound-box, of an inter- Y nally threaded boss, means pivotally connecting the threaded boss to the soundboX, ayielding member fixed at one end to K LA! the threaded boss and at the other end atscrewing on the rigid member and Vserving as means for locking the rigid lever in position. Y

3. In -a sound reproducing device, the combination or' an internally threaded oscillatory member, a lever for carrying the reproducing stylus screwing into the oscillatory member, Y and a Weighted member screwing on the lever and serving as a means for locking the lever relatively to the oscillatory member. v

BRl'lAN NIO 'SOLARO DEL BORGO. 

